Gas-operated firearm.



6 0 9 1 0 l R P A D E T N E T A P um T I M S R M am 9 1 7 1 8 0 N GASOPERATED FIREARM. APPLICATION FILED 11.27. 1904.

10 SHEETS-SHEET 1.

INVENTOR A TTORNE Y3 WITNESSES.-

R5 817,198. PATENTBD APR. 10, 1906.

- I M. RSMITH.

GAS OPERATED FIREARM.

APPLICATION FILED APR.27. 1904.

10 SHEETS-SHEET 2.

lNV ENTOR.

A TTORNE Y5 r I I llllirllflmrllrl llllt PATENTED APR. 10, 1906.

M. F. SMITH. GAS OPERATED FIREARM.

APPLIOATION FILED 11.21. 1904.

10 SHEBTSSHEET 3.

11V VEN TOR.

m w A n W ATTORNEYS PATENTED APR. 10, 1906.

M. F. SMITH. GAS OPERATED FIREARM.

APPLICATION FILED 11.21. 1904.

mw m.

PATENTED APR. 10, 1906.

' M. F. SMITH. GAS OPERATED FIREARM. APPLICATION FILED APR.27. 1904.

10 SHEETS-SHEET 5.

JNVENTOR. m 211M 3x752 A TT RNE Y's PATENTED APR. 10,- 1906,

M. F. SMITH. GAS OPERATED FIREARM. APPLICATION FILED APR.27. 1904.

INVENTOR. b M m/ 10 SHEETSSHEET 6.

A TTORNEYfi No. 817.198. PATENTED APRJO, 1906. M. F. SMITH. GAS OPERATEDFIREARM.

APPLICATION FILED APR.27. 1904.

10 SHEETS-SHEET 7.

" JNVENTOR.

W MM I x /v\......

{ y M. E. SMITH. I GAS OPERATED FIREARM.

} APPLICATION FILED APR.27. 1904.

PATENTED APR. 10, 1906.

10 SHEETS-SHEBT 8.

W1 TNESSES: JNVENTOgK PATENTED APR. l0 1906.

M. F. SMITH.

GAS OPERATED FIREARM.

APPLICATION FILED APR,27.1904.

10 SHEETS-SHEET 9.

INVENTORI W find M WITNESSES A TTORNEYS.

PATENTED APR. 10, 1906.

11. SMITH. GAS OPERATED FIREARM. APPLICATION FILED APR.27. 1904.

10 SHEETS-SHEET 1o.

I I 4.14m

Attorney! I i Thrall iuhom tt concern.

' Be it known .thatI, MoRRIs FonD'SMITH, 'a

cation;

I and cushioning the breech-bolt.

v are applicable to firearms in general, they are through the receiverportion of the gun, wit h Philadelphia, in {the 'county'of Philadelphiacertain new and useful Improvements in Firearms, of the following isaspecifiing the breech-bolt,.manually operating the my invention will "beillustrated and de- 25 shoulder-arm.

ngs in wlnch- Fi ii'F-ED S. rt-Ii? fifi'iiliihi i @FFICE.

ITHREE-FOURTHS TO WILLIAM l).

CONDl'i, OF DES MOINES, IOl/VA.

GAS-OPERATED FIREARM.

c'itizen of the ,United States, and a resident of and State ofPennsylvania, have invented l'lhisfiinifention has for its obj ecttoprovide an improved means for mounting the trigger,

sear against movement, locking and operatbreech-bolt and holding it inan open position,

Other objects and advantages will appear in the following descriptionand'will be particularly pointed out in the appended claims. i

While some of the features of my invention designedf more particularlyin connection with firearms of the gas-operated type, and

scribed in connection with a gas-operated My invention consists in.certain novel features of construction and combinations of features tobe hereinafter fully described, and particularly pointed out in theclaims, refer ence being had to the accompanying drawfigure! is a sideview of a military rifle embodying the several features of my presentinvention. Fig. 2 is an enlarged vertical section in the plane of theaxis of the barrel the firing-pin in cocked position and thesafety-catch engaging the sear to prevent the release of the firing-pin,some of the working parts being shown in elevation. Fig. 3 is a viewsimilar to Fig. 2 in which the safet vcatch has been withdrawn frombeneath the scar and the trigger has been pulled and the firing-pinprojected against the primer. Fig.

4 is a view similar to Figs. 2 and 3, in which i the arts have beenmoved by the gas-open atet mechanism to the positions which theyseverally assume when the receiver is open, the spent shell having beenthrown out and a new charge having been placed in position to beintroduced into the chamber of the gun by the forward movement of thebl'QGCll-bolt.

' Specification of Letters Patent. Application filed April 27,1904.set-in No. 205.226.

Patented April 10, 1906.

Fig. 5 is a horizontal section. through the portion of the gun shown inFigs. 2 to 4 with the parts in positions corresponding to Fig. 3.

Fig. 6 is a vertical transverse section on the line 6 6, Figs.'3 and 12.Fig. 7 is a vertical transverse section on the line 7 7, Fig. 4. Fig. 8is a vertical transverse section on the line 8 8, Fig. 3. verse sectionon the line 9 9, Fig. 3.

Fig. 9 is .a vertical trans- Fig. 10

is a vertical transverse sect-ion on the line 10 10, Fig. 3. F ig.. 11.is a vertical transverse section on the line 11 11, Fig. 17. Fig. 12 isa side elevation of the portion of the gun shown in Figs. 2 to 5. Fig.13 is a side elevation of the breech bolt and parts carried thereby,together with the connecting-rod which looks and unlocks the locking-barand rcciprocates the breech-bolt. The connectingrod is at the rear limitof its movement rela-.

tive to the breech-bolt and consequently has drawn the locking-bardownward. Fig. 14 is a view similar to Fig. 13, in which theconnecting-rod is at the forward limit of its movement relative to thebreech-bolt. Fig. 15 is a vertical transverse section on the line 15 15,Fig. 13. verse section on the line 16 16, Fig. 14. Fig. 17 is a verticallongitudinal section of the forward portions of the gun on the line 1717, Fig. 6; and Fig. 17 is a transverse section therethrough on line 1717, Fig. 1.7. Fig. 18 is a vertical longitudinal section of'the forwardend of the gun. Figs. 19 and 20 are transverse sectional views on thelines 19 19 and 20, Fig. 18, of the front band which connects the framewith the barrel. Fig. 21 is a perspective view of the stock of the gunwith all wooden and movable parts removed. Fig. 22 is a sectionalperspective showing the magazine locked against feeding. Fig. 23 is Fig.1-6 is a vertical transconstruction and are hereinafter fully de--scribed.

plate. I

In any type of gun it IS desirable to have 11 represents the magazinefloor- I 21 is such that a hunted lndependent movethebrdech-bolt'limited to a single back -and-' l firing-pin and fitted toslide in the'rear end of forth movement andnot subject to any trans-'verse movement for locking and unlockin it; For. this reason my presentinvention emp oys" a breech-bolt 12, guided in its longitudinalmovements between a track 13, formed by the to of-the frame 14, andatrack '15, ro-' vided y thetop of the receiver 3. To ock thebreech-bolt m its forward or closed posi fiset 16, ,which-receivestherear en of a eking dog or' 17, fulcrumed by its bifnigcated forward end18 on o posite sides of breech-boltg12 near the orward end of ovedownward into a'recess 19, formed in' the upper portion of thebreech-bolt, and has ment of'thelocking-bar with the breechbolt ceiver.The Wings 20 are rovided with camgrooves 21 m their outer aces, whichreceive pins 22 on the inner faces of a bifurcated operating or driverod23, which extends forward and is connected to the gas-operatedmechanism. The shape of the grooves 21 is such that the locking-bar 17is moved into i the offset 16 by the forward movement of theoperating-rod 23 and is drawn downwardly out said 0 set and into therecess 1 9 by the rearward movements of said operating-rod, these-movements being followed, respectively% by the 0 ening and. closingmovements 0 the breec bolt. The shape of the grooves ment of.theoperating-rod 23 relative to'the breech-bolt is "permitted. Thismovement occurs-at the first part of the rearward movement of theoperating-rod and at the last part of its forward movement, and duringthis relative movement the locking-.baris tion.

moved from and returned to its locked posi- The forward portions of theooves 21 are of a 'very low pitch, so as to ve the operating-rod greaterower over the ockingbar to unlock and 100 it, while the rear portions ofsaid grooves are of much greater itch to accelerate the movement of the100 'ngbar after it is released from its seat. The

4 rear ends of said grooves are formed with approximatelvsermcircularrecesses extending argely in front of the-carn-pins when they are intheir rearmost position in the camgrooves, to provide substantialshoulders at such an le as to take nearly all the forward thrust o theoperating-rod and avoid transmission of this'thrust u wardly to such anextent as would materia ly increase the friction on the upper track 15.

The firingpin has lat-longitudinal bore to receive the projecting spring25', and this sprin abuts at its rear end against a bushing 26, teescoping over the open rear end of the tion, the receiver 3 isformed-with 'an u ward transmitted bly d bolt.. The locking-bar 17isadapted to.

the breech-bolt and there secured by a pin 27. -LThe pm 27 engages thebushing 26 through a by the e a ement of the bushing with the rear end 0t e receiver amen abutment and the absorpt on in the spr ng of the workt the breech-b0 t. initial compression by t e cookin of the firing-pin24, it follows 'thatwhen tile bushing "26 strikesthe'rear end ofthe receiver the sprin 25 must be further compressed by contmue rearwardmovement of the breechbolt' 12, and this wilLarrest the breech-bolt andtend to start it forward again by the time the-operating-rod is reversedin its movescribed. A

The cocking of the firingpin is accomplished by means of an additionalpair of inwardly-extending integral projections 29 on the operatin -rod-'23, which work through slots 30 in t e sides of the breech-bolt andengage in front of the shoulder 31 of the firin -pm. This is especiallyadvantageous, in that the firin -pin is cocked by the rearward movement0 the operating-rod and is prevented from striking the primer until theoperating-rod returns to its foremost limit again in the event of thefailure of the sear to retain the firingin, and this renders prematurefire impossi 1e.

.32 represents the sear which is retained b pins 33 on opposite sides ofthe frame andfu crumed by its bifurcated forward portion 33 in theirhearings on opposite sides of the ejector-post 34, which is mounted in adovetailed seat 35, and projecting upwardly works through a slot 36 inthe breech-bolt and a slot 36, Figs. 15 and 16, in the enlargement 37,formed on the under side of the firing-pin to provide the shoulder forengagement with the sear. (See Fig. 7.) T e sear 32 is pressed normallyupward by a s ring 38.

39 represents the trigger fulcrumed at 40 he i'earwand momentum of v Thes ring 25. being under ment by a return-spring, to be hereinafter de-\8 in a longitudinally-movable fulcrum-block 41,

which 15 pressed normally forward. by a s ring42 and having a T-head 43(shown by otted lines in Fig. 3 and in plan in Fig. 5) in the ath of theoperatingrod, so that when the reech-boltnears its rear limit it impartsrear movement to the fulcrum-block 41 and draws-the trigger 39 off thesear 32. This permits the sear to return under the action of its spring38 to position for engagement with the firing-pin, so that the gun willremain cocked after each shot followed bv the automatic opening of thebreech an introductlon of a new charge.

44 represents the trigger-spring.

, y 1-guard; wh1 1e=iiteis moved out lof ngage ent,

.' jguardie It' 1s heldin eithen ofiitspositionsby mean-set a at sprng-53;fize eti re r endr 54and1-hwinga serrated front'e'nd- 55=ywhichjgether. ,a pivotal connection [at-the point e g i- 1, W 2 Tthe'fmme e-P positiom; the- 's 'r-L position-to e movediintdinga I t jg-Qifessingit "in-front 'of thegtrigger receives. a tooth"5610n the"s ide of thesafety= -v snitablefdrm of magazine may-beem-I vertie allvibenath thereceiver with'a 081E850.-

- 4o :fulcrumed at 57 andca l fu 1crumed ona lever 59, which-is inturnfulfnll'linesjin Figsliand 9.)! lfjflqydii I have shown;almagazine-located it'y-foi five' charge's-andha a cover 11,

' L' {crunied' at 60. on the'cover-andpressed up- Wardby as Thecrating-rod 23 is,.-'a"s state bifurcated an carries at its 4 -CrQS1ead, which ositioned'l-below the barrel, .asuitable'pus 'on'," preferablycomprising a dash-lpot .62, workm over afixed ,pliir-igerf63 -,-onthe' -frame of t e gun.'-f-The si'd'e's of theoperatin'g-rod are"'pos1tioned-onso ,the" sides of the magazine and are connected totheirJcross-head by fittingfin dovetailedilassm'g throngh them and f-jthroughthe crossead' is the-taper pin 65.

w i "66' represents the-gas-op'erated piston-rod;- '53 which "screwsinto the cross-head -.-z t-;67 and hasapointed end 68,,ewhich-enters.asea't 69 v in the taper pin'65 and prevents displacement;

-- ,:of m r- 70- re resents-the piston on theu-forward ;.'der71 andreceives-gas-piiess r f pm th gun-barrel through a port"72 z;i()

, ,of accommodating 'asufliciently "longtsprin 1,gontthebarrelfthis-portfmis-formed-at a sui ble angle-mfthegunbarrel,isothat-it'leave lam a i e lift 52 l &thf he,. 0 4 232., 0 the stock,-1s".,prov1ded wltha front plate 73 t t I aim -bifurc ated,x 'as shown; at 174,=to'f'permitthe wnwardly by the; er andathe eflforwai df; ortionvof gthe=.ti 'ig'gergsecket :7 5-, with a. spring-pressed etaining ges seenthat, the=lever: 9; projects laterally 'catiililf- (See dotteii lines,Figs'. 2 andanda eed-table 58,,

to the material' reduction in thefl'en'gth of the barrel 75 110W P m Sev e-guns, the-necesfsity on] the one of'having the gas- -taken-- omthebarrel at a sufficient distance back from the muzzle and, on the otherhand he borej' at fa point] considerably her t -e'nters the cylinderhead 87; hisport isjof uniform d' V e 'i li' fi f 4. amped fin-,-asjitis essential-that t onducte at thelprejssurefwhich it"has nxth ore;1 the piston material-2:

T ff 5mm 18,,hti151iaiti? he.

band itoxclamp mum the" stock and "havin' formed integral therewitha,bayonet or To from a longitudinally-sliding hand-retracting bar' or bolt78, guidec l in a socket 79 on the sideof the receiver, the socket beingjjiiovided "with an extensionp79", rovidingl a s udder operation by thegases.

79 --"-a tlits forward end,=1n front offwi' 'ch the lever 9 rests whenthe gunis iniconed ition for When itis desired'to o'p'en-tlh egljtreech.by; 7

hand, the lever 9i's elevated, there? fnoving it fromin frontof theshoulder-79?;- qscillatf,

.ing the retracting-bar and. causing an ecc"n'- 'trically-pivoted pin801to enter arecess 81 in one of the side niexnh'ersof theoperating-rod23, thus establishing a controlling connection with .the breech-bolt; vThe pin 80 is pivoted IIO in the retracting-bolt by means of a smallforwardly-extending trunnion 80 and a large rearwardl extending trunnion80", the pe- 'r-iphery o the latter intersecting-the periph- The lever 9is move A 80 has entered recess 81, the pin SO during "this-movementtraveling in a slot 81?. in the =Qceiver.,:-'(See Figil; 5.) v :i grpThestop 10 int ery of, the retracting-bolt, as shown in Fi'g. 9.rearwardly'after the pix);

. g5. ing' -'bolt str ets s v ral-warez. "rilevei'r 9-Zengagesjthe stopzit 'whic itnefof the artridge, rev fi the breech-bolt ogen, to cleanthe grin-or for'j est ' theection of; thereturnespring;F;If,;however,

fit'isideslired'toiextractthe shell and feed by v i -Khalid insteadofcfronithenragazine whe'n 'the r l megqzineisnot ein 'ty; 'it,i'shecessziry topre a V vent the breech-b tzmoving. to the extreme green'This is "done :by n'owingfthe'stop 10 to it hethird'end last.position',;es shown'in Figsf g.s-,1 22,;. end23 ,11?'In-th s etiti n theretract; 'nt the I I time the; hreech bolt will bei disposed above therear,

*the upper-- most certrid'ge, ett nginfront'o the breech 72o, boitandib'ei'ng; ed forward when the breech j-bolt'moyes-forwardfl a .f Thestop lfl'is held in varitins positionsby'e spri -pressed pin which rides"into end 'o'uto recesses 10 on one of the lugs in which "zslfthe stopis pivoted. a "Ref' g" to Fig: 1, the gun; as, before "stated, isarranged es etakedown by having 4 the barrel andfreceiver separablefr'omthetf H ortion of the frame that carries 'the' .st'ock. 0' I o gainaceesstq the gas-operated parts, it is' not ne'cessii'ry to remove 'te-bands 7 and'S,

- but sii'n'pl' to remove the front sight 5,- to loosen en band 8, and:to turnthe catch 84, czirried by the barrel-frame and -'pro j eetinginto 'a rotatable and grooved keeper 85 in the lower sideof the guide86. (See Figs.l.7 and 17*.) When the catch84 is rotated to bring the rib84 on its uppenenfd longitudinal with the bore of' the gun and 'inalinenent with oiguide-g'rooye 84, carried by th'e'barrel, the barrel-framemay be lifted slightly at its for 'ward eh'dfrom behind the shoulder onthe barrel, th' opening in the barrel-franne being enlarged permit-tl1'is inove nent. I The fraine may then be slid endwise over the bar-.rel and withdrawn, which will expose the gas tube or cvlinder and itssecuring-head S7. The sec-uringdiead (see Fig. 18) is fitted by adovetailed groove 88 to an undercut tongue; 59 89 on the underside ofthe grin-barrel andmay be withdrawn longitudinally after dcpressing itsdetent90, pressed vvertically bya spri'ng 91anto a socket. 9; on theunder side 1 of the barrel, talking the cylinder with it and leavin thepiston with its rod connected the parts which it operates, as alreadyKwith described. The spring 93 for. returning the piston forward sezitsat its forward end against the piston a'nd at itsrearend against therear 66 "end of the guide 86, already referred to, the pi,ston-rodworking through the rear wall of @Ihis guide, aselearlyshown 111F155.1T. if Q 1 Having. thus described nrVinvention; what f ";I "c-lainiis.f-to "on Positi'on-to prevent eg s breech-bolt, and the magazine; ofan-oscilla- 1. Inn ges-operated'fireerrn, thecombinetion" with the'rnagezinega breech-bolt movable toward endifro'm-ithe breech across themagazine, and a gasmperzited driye rod, of

" hend operat'ed meanslnormjally' gout 'of en,-

gege n'ent''W itl i the breech-bolt andiadeptedjo to e'thrown. mtoeonneetion'wlth the breechbolt to moire. it; and .t ns fofr; therearward" movementot :the 'breechf ebe t' to," prevent. a; 'feedfromjthe'magezine bt'it to per f nite hand feed into the breech.- 2,jInamegagine fireerm,% thecornbinetiog ';'I'neg'azine ahd to'anotherpositio "8o breech open.x' 1 ;"-';.-3.;-InT a gun, the. combination 'wfi h .t'he I breech-bolt, of anosei-lletory eirid slidin'g' re.- ltraetinbar, fendadpin throughziwhich the breecholt i's move by the-her,eccentric- Ball -pivotedj enseid retra ctingebannlndiiidv-T ab einto'and'out of=cbntrolling relation with sgeid-bolt onthe oscillationof the'retraoting er. 14; In a gun, the combination with "the 'tory andsliding; retrecting 'pagr a, stopend a pin, through which-the reath-tnts moved ythe-baneccentricall vmounted on 'said re tracting-bar andmove. le intoandontof eon- I trolling-relation with'said bolt on theoscillation of the retracting-hair, said-stop 'niovable to a position topermit'afeed frolii the nagazine end to apposition to limitltherearwardmovement of. the'breech-bolt to prevent a-' feed from the magazine; v i

5:. In a gnn,'the coiiibin'ation' with the breech-bolt, ofanosc-illatory and sliding retracting-bar. 'and a ,pin through which thebreech-bolt is moved "by the hart-eccentric- 105 ally mounted onsaidretractihg-har and movable into and out of controlling relation withsaid boiton the oscillation of the re'-' tracting-bar, and meansengaging the. retmcting ba'r to hold the breech open,

too

6. In a gun, the. combination with the breech-bolt, of an oscillator andsliding retracting-bar, a pin-through which the breechbolt is moved bythe bar, eccentrically mounted,on said-retracting-bei' and movable intoand out of controlling relationwith said bolt on theoscillation .oftheretraetingbar, and a stop moi-able to a position to limit the slidingmovement-of the retracting-bar and-.to another position to engg'ge' thebar to hold the breech open-.- a

7; In a 1111, the combination mth lzhe mag 'azine. an the breech bolt ofhand -operated moans nor-mall out of connect on'with the breech-bolt butadaptedfon connection with the same, and'meana mov able to one posit onto engage the hand-operated means'and limit i its rearward" mqyfeme'ntto p e nt a feed from the magazine and tofanother position to Permit thefeed. v 8 ,In a gun, the combination with the magazine'ar'i'dthe'br'eech-bolt, of hand-operated means normally out of connection withthe breech-bolt but adapted. for connecti'ori' with I the same,'andmeansmovable to and; from a position to limit the rearward movementof the-hand-operated means said means being I '1 Q"m0vable ,-'toanotherfposition to'engage the- Y .hand-operated -means and hold thebreech '4 9. The combination ofthe breech-boltiirovidedlwithslotsonopposite'sides, a firing:

' 1 5 a lockin -bar fulcrumed onthe forward portion of said bolt and itsrear end-forming the locking-abutment, wings extending downwardl onopposite sides of the breech-bolt,

i provi ed cam-slots, and a bifurcated connectin rod, each member ofwhich carries ja stu which en ages inlone of the camslots tocont-roltheocking-bar,fand a. stud which enters one of the slots on the side of thebolt and engages the firing-pin.

2 5 10. The combination with the receiver-and the breech-bolt havingguide-faces uided ceiver; of a lockin -bar fulcrurned on the forwardportion of t e breech-bolt, fitted'in a 3o recess in said breech-boltand having its rear end' movable upward outof said recess and 1 intoengagement-with an offset in'the receiver when the breech-bolt is initsclosed position; and win s on the locking-bar ex- 5 tending downwaron opposite sides of the secured on the breech-bolt orming the rearabutment for the spring, and aving a limited movement'in the breech-boltand an abutment on the frame with which the bushing contacts near theend of the movement of the breech-bolt to cushion the latter at itsrearward limit. p

12; In combination with the breech-bolt,

the firing-pin mounted therein and the projecting-spring for thefiring-pin; of a bushing secured on the breech-bolt by a slot-'and-pinconnection'forming the rear abutment for the spring,' and having alimited movement in the breech-bolt, and an abutment on the gun withwhich the bushing contacts near the end of the movement of thebreech-bolt, tocushion said bolt.

6 13. In combination with the firing-pin,-

and means for cocking the same; a sear having a bifurcated forward end1ntroducedilongitudinally into suitable bearings and a pin between upperand lower tracks int 6 reside members-an ton-rod screwed 1ntothecross-head and havengaging-I'n rear of the sear holding it in itsbearings, v '65 14;;Thecombination of the breech-bolt having afiring-pin andan] extractor, an ejector'-p'ost,'anda sear formed with abifurcated forward'endseated in bearings OIIzOPPOSitG sides "ot theejector-post, "j

15. In an automatic-gun actuated by=.fir-. ing, the combination-with thebreech-bolt having a firing-pin, the sear-{the trigger, and a slidingblock inwhich' the trigger is mount:

ed, projecting intothe path of a part moved; 1

by the firing ofthe'guny. 1 1

.16. In an automatic gun actuatediihwfiring, .the='combination' ofthebreech-bolt,-"the 4 I operating-rod for reciprocatingthe-{breechbolt, the searythetngger, and; a" movable 8o block inwhichthe trigger is mounted, having lateral projections in t e path ofthe operating-rod. y

-. 17. In combination with the breech-bolt, a

. bifurcated operating-rod for reciprocating it, 8 5

consistin o the cross head the side members fitted by dovetailed socketsto the crosshead, and the taper pin passing through the side members andthe cross-head.

-18. In combination ch-the breech-bolt, a bifurcated o crating-rod forreciprocating it, consistin o the'cross-head, the side members fitte bydovetailed sockets to the crosshead, and the ta er pin passing throughthe -the cross-head and the pis.-

mg a taper end seated inthe taper pin.

' 19. The combination of a breech-bolt provided with locking meansmovable to and from the breech and having cam-slots dis- IOO posed onopposite sides thereof, and a bifurcated connecting-rod each member ofwhich is located on one side ofthe breech-bolt and z carries aninwardly-extending stud engaging in one of the cam-slots to "cause thelocking and unlocking of the breech-bolt when the/ rod is moved.

20. The combination with the breech-bolt, of a locking-dog carriedthereby and provided with cam-slots on opposite sides. there- I x o of,and a bifurcated connecting-rod each member being located on one side ofthe bIGGQhebOlt and having an innardlixextending stud en aging in one ofthe Cami-slots to causetheloc ing and unlockingof tlnbrccchn5 bolt.

21.. The combination of the breech-bolt movable-to and from the breechto close it and havingcain-slots disposed on opposite sides thereof, theforward portions of the \20 slots being of low pitch, and the end portons being recessed to provide a shoulder-mind bifurcated connectin :rodhaving eachi'hem ber located on one sid e of the breech-belt and enaging in the forward portion of the Slot to "1.5

